Apparatus for drying or cooling material



Oct. 30, 1928.

A. G. HUHN APPARATUS FOR DRYING 0R COOLING MATERIAL Filed NOV. 18. 1925 6 Sheets-Sheet 1 jIL III

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Filed Nov. 18, 1925 6 Sheets-Sheet 3 Oct. 30, 1928.

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A G. HUHN APPARATUS FOR DRYING 0R COOLING MATERIAL Filed Nov. 18. 1925 6 Sheets-Sheet 6 Patented Oct. 30, 1928.

- UNITED STATE S PATENT OFFICE.

113E116. man, or mnaroms; MINNESOTA, .ASS-IGNOR mo in. zmctnnmmm'ncmua county, or .mmnnaroms, MINNESOTA, A connomnong Armenians .FOR DRYING on .COOLING MAmEnIA-n Application filed ndv mbei- 18, 1925. :Serial No. 69 ,774

.My invention relates to apparatus for drying or cooling material and more particularly material in a 'finely divided condition such. aslflour and starch Whiohfhas a tendency to cling to heated or chilled surfaces an'd'thus become scorched orunduly chilled thereby.

. An object theinvention is to prevent'the the objects of my invention by providing a .oleaning mechanism which rec prooates along possibility of any of the material being treated from lodging'or remaining onthe substantiallyhorizontahtubes which I employ and thereby beingsubjeoted'to an excessive action of the heating, cooling or freezlng agents used Within the tubes. I accomplish the tubes in engagement with the outer surfaces thereof and thereby continiiouslyremoves the material substantially as fast as it accumulates thereon. o r V Thefull objects of lniy invention will appear in connection with the detailed descrip- .pointed out 'in the claims.

In theaccompanying drawings which illus- ;practicalembodiment of my inven- ,tion,

tion thereof andftfhe novel features embodied iirmy inventive idea will be particularly trate a Fig. is .a View of the apparatus in central longitudinal section. Fig. 2 .is a front elevational view. Fig.3 isa rear elevational isa' ,view in section onfthe Iine99.ojflFig.;8. Fig, 10 isa .Qrni 1st vie-Win section on the, line '1010 Referring to the embodiment of invention shown in the drawings; abattery' of parallel tubesl'l are all supported. atone end I \bysecnring them to ahead '12 and aresup.

.ponted .at .the ether "end by extending a few A {of theituhes, as'indicated at 1'6,'1andsecu1-ing these extended tribes to supporting means carriedbyia castingl l. Withimthe tubes 11 and spaeed tromlthe wallsthereonarelsnialler v,tubes w ich .as shown in Fig. 1 pass 1 -.through ithe head'.l2 into ?afsnp'plybox18, itorwhiehn heatinggnr eoolingzagent is sup- ;plied byapipe 20. Theonter tubes ,11, which are ,closed at their front .en'ds, have their rear ends-leading intoadiseharge-box 22 from which the heating or cooling agent is withdrawnthrough a pipe 24. lhttachedfto the head '12 is a forwardly-extending rim 26 'i'ron the bottom of whic'h a dischargepipe QSeXtends, and from the top of Whichthere extends'a pipe 30, which may be connected to a suction device orfan in the usual manner for drawing air through onfrom a casing or cylinder '32 which envelops the. tribes 11 and is rotatably supported upon rollers 34 which engage rings 35 placed around the casing as shown in Fig. 1. "The casing is rotat-ed by means of an annular gear 36 secured thereto at t-he front and driven by }a spur gear 37 secured to a shaft '38 to wh'ich'is also oi the casing 32 is provided with aplurality secured 'a driving pulley 39. The interior of flights 40, vand in use thecasing is ;pr 'e'ferably inclineddownward ly 'froin' the inletto the outlet end. The rear. of the Jcas'ing 32 makes .a tight o'intiwith the rim 26 and the frontof the casing is partlyclosedfbyan annular plate 42 whose innermargin bears rotatably upon-ai ing 44: securedftothefoast- 111g 14. The central portion'of this casting is slide 16 and is also provided wfi'th -an openso bulged outwardly and'is provided withfa ing'in which an elbow L8 is seoured. .Se-

cured to the outer end of this e'l'bo'w'is a spout- 50 for introducing materialfinto the 'casing fortreatment. The tubes 11 are'held in fixed positionat the rear. by the "head .12, while at the 'front the greater portion of the tubes-are supported from the few longertubfes 16 by means of a plate 52 provided with holes for the passage of the tubes. As s'hown in" Fig. ,5, the casing 32p1eferably consists of two sheet metal cylindrical members one around the other and between which a layer of asbestos is placed. As shown inFigs-l 4 and6, the casing at any convenient place may be provided with a removable Closure.

To provide for this closurea hole is madelin the casing-land an annularinenibei fieis secured to" the material surrounding this hole by l)olts 56. The inner marginal portion of the member 54 is depressed andisfprovided with an annular groove SSJand Witha flanged portion 60. A cover ,62 lined with asbestos packing G3 has its peiiiphery turned down wardly to engage packing 64 placed in the groove 58 and is ssecl'lred in place :bytsc rewboltsfifiwhose heads are received inldepres sions. in the cover and whose. screw-thread ed portions engage screw-threaded holes in the.;

flange 60. In order to prevent the material which is being treated from sticking to the tubes a cleaning device is provided. his device in the embodiment shown consists of two cell-like members (58 having walls which rest upon the upper sides of the tubes 11 to act as scrapers, the cells preferably being of the same shape as that of the tubes. The tubes have been shown as diamond shape, but it will be understood that they may be made of any other suitable shape. The two ceillike members 68 are spaced apart a distance from each other less than half the length of the tubes 11, so that they can be reciprocated along these tubes for the entire length thereof and they are connected by a number of bars 70, as will be understood from Figs. 5 and 7. In order to reciprocate the members 68 the mechanism now to be described is provided. As shown in Fig. 2, a sprocket gear 72 is secured to the sh aft 38. A sprocket chain 74 runs around the sprocket gear 72 and around a sprocket gear secured to a shaft 78 whereby the latter is rotated. As shown in Fig. 0, the shaft 78 is mounted in bearings 80 and 82 formed in a. housing 8b which is provided with a removable top 8-1. Loosely mounted on the shaft 78 are two oppositely-disposed bevel gears 86 and 81' having clutch projections adapted to be alternately engaged by a clutch member 88 splined on the shaft 78. The gears 80 and 87 mesh with a gear 90 at diametrically opposite sides thereof. The gear 90 is secured to a shaft 92 to which is also secured a gear D l meshing with a gear 06 rotatable on a stub shaft 98 carried by the housing. Secured to the hub oi? the gear 90 is a wheel 100 which has a recessed groove 102 therein. Two bolts 101 and 106, which may carry rollers as shown, are secured by their heads in this groove and they may be adjusted to any desired position upon loosening the nuts with which they are provided. An arm 108 is pivotally attached at its lower end to the housing 83 by means of a bolt 110. A rod 112 is pivotally attached to the upper end of the arm 108, and this rod passes slidably through the two branches of a yoke member 111 which is rockingly attached to the housing 83 by a belt 116. The rod 112 is surrounded by a coiled spring 118 which is interposed between the upper branch of the yoke 114. and a. cotter pin 120 passing through the rod. The arm 108 is provided with an ofl'set projection 122 which during the operation of the machine is alternately struck on its opposite sides by the bolts 104 and 106 as the direction of rotation of the gear 96 and wheel 100 is changed. In order to shift the clutch member 80 it is provided with a circumferential groove in which a clutch fork 121 fits. This clutch fork has a stem 126 which extends into a slot 128 formed in the intermediate portion of the arm 108. It is apparent that by the construction just described the shaft 02 will be rocked back and forth. This shalt extends transversely across the top of the casing or cylinder and is supported at its outer end in a bearing 130 carried by a support 1132. Secured to this shaft are two drums 131 and 136 upon which are wound l't.:-i1)t.(fll\'tl a few turns of cables 138 and which at the trout oil? the machine engage sheaves 11-2 and 1 11-, whereby their direction is changed in order that they may pass through the front wall 0 t' the casing and be secured to the scraper device. The other portions of the cables 1 38 and 110 extend rearwardly and first engage sheaves 116 and 14-8 and then engage sheaves 150 and 152 respectively. whereby their direction is changed in order that they may pass through the rear wall of the casing and be secured to the scraper device. It will be understood that the cables pass snugly through openings in the end walls of the easing so as to make a substantially air-tight lit.

The operation and advantages of my inveniion will be obvious in connection with the foregoing description. The material to be treated is fed into the front of the casing through the spout 50 and as it passes progressively toward the rear it is continually lifted by the flights -10 as the casing rotates and is dropped repeatedly upon the tubes 11. These tubes are preferably arranged in staggered relation in a plurality of rows, as shown in Fig. 5, so that the material falls in a sinuous path between the tubes and is subjected to the influence oi the heating or cooling agent which is passing through the tubes. The cleaning or scraping mechanism prevents any of the material from remaining on the tops of the tubes whereby scorching, injurious chilling or clogging is avoided. The shalt 78, as will be apparent from Fig. 2, is driven by the same source of power that rotates the casing, so that the clutch member 88, which is splined on this shaft, as shown in Fig. 0, will rotate continuously therewith. \Vhen the clutch member 88 is at the right as shown in this figure, it engages the gear 87, whereby the gear 90 is rotated in one direction and when this clutch member is moved toward the left it engages the gear 86, whereby the gear 90 is turned in the other direction. The shaft 92 to which. the gear 90 is secured is thus caused to rotate alternately in opposite directions, and by means of the drums secured to this shaft, the cables 138 and 140 produce a reciprocation of the scraper members along the tubes 11. By means of the gears 9 1 and 96, the wheel 100, carrying the bolts 104; and 106, is caused to turn in opposite direc tions alternately so that opposite sides of the projection 122 are struck by the bolts. The provision of the slot 123 in the arm 108 permits a slight movement of this arm be fore the shifting movement of the clutch sitionthe' expansion of the spring aids in forcing homethe clutch member 88 so that the gears 86 and 87 are firmly clutched.

I claim: 7

1. Apparatus for drying or cooling material comprising a rotatable casing, a plurality of fixed tubes extending within said casing, said tubes serving to contain a temperaturechanging agent, a cleaning device engaging the exterior of said tubes, and mechanism for reciprocating said cleaning device and rotating said casing from the same source of;

power. 7

2. Apparatus for drying or cooling material comprising a rotatable casing, a plurality of fixed tubes extending within said casing, said tubes servingto contain a temperaturechanging agent, means for successively lifting the material and dropping it upon the top of said tubes, a cleaningdevice engaging the and mechanism for reciprocating said cleaning device.

3. Apparatus for drying or cooling material comprising a rotatable casing, a plurality of fixed tubes extending within, said casing, said tubes serving to contain a temperature changing agent, a cleaning device engaging the exterior of said tubes, a cable extending through the opposite ends of said casing and attached to sald cleaning dev ce, and means for moving said cable alternately in opposite y directions to reciprocate said cleaning device.

' 1. Apparatus or drying or cooling'material comprising a rotatable casing, a plurality of fixed tubes extendingwithin said casing, said tubes servingto contain a temperaturechanging agent, a scraping device engaging the exterior of saidtubes, cables extending through the opposite ends of said casing and attached to said scraping device, drums around which said cables pass, a shaft to which said drums are secured, and means for rocking said shaft to cause reciprocation of said scrapingdevice. I I I 5. Apparatus for drying or cooling material comprising a casing, means for rotating said casing, a plurality of fixed tubes extending within said casing, said tubes serving to contain a temperature-changing agent, a platelike'member having openings through which said tubes pass respectively with the upper margins of said openings resting upon the upper surfaces of said tubes for produc-' ing a scraping action, and mechanism for reciprocating said platelike member.

6. Apparatus for drying or cooling material comprising a casing, means for rotating said casing, a plurality of fixed tubes extend ing within said casing, said tubes being angular in cross section and serving to contain a temperature-changing agent, a platelike member having corresponding angular openings through which said tubes pass respectivelywith the upper margins of said openings resting upon the upper surfaces of said tubes for producing a scraping action, and

mechanism for reciprocating said platelike member.

7 Apparatus fordrying and cooling material comprising a casing, means for rotating said casing, a plurality of fixed tubes extending with said casing, said tubes serving to contain a temperature-changing. agent, two platelike members having openings through which said tubes pass respectively with the upper margins of said openings resting upon the upper surfaces of said tubes for producing a scraping action, connecting means between said platelike members for holding 1 them spaced from each other at a distance less than half the length of said tubes, and mocha-- nism for reciprocating said platelike mem- I bers. v In testimony whereof I hereunto afiix my signature. o

ALEX G. HUHN. 

